如何通过 kotlin 中的 retrofit2 获取 json

Question

我使用 retrofit2 连接到 api 并接收数据数据嵌套

D/OkHttp: {"success":{"token":"eyJ0eXAiOiJKV1QiLCJhbGciOiJSUzI1NiJ9}}

如果数据如上例，则接收无问题但是如果是如下，则报错

D/OkHttp: {"message":"Unauthenticated."}

我为第一个例子这样做

data class Response(var success : AutoLoginUser)
data class AutoLoginUser(var token: String)
...
...
...
Log.w("OK FROM SERVER", response.body()!!.success!!.token)

对于第二个示例，我执行以下操作

data class UserDetails(var message : String)
...
...
...
Log.w("OK FROM SERVER", response.body()!!.message)

第二个例子的错误

D/OkHttp: <-- 401 Unauthorized http://192.168.1.8/api/details (252ms)
Host: 192.168.1.8
Date: Wed, 02 Dec 2020 09:01:03 GMT
Connection: close
X-Powered-By: PHP/7.4.12
Cache-Control: no-cache, private
Date: Wed, 02 Dec 2020 09:01:03 GMT
Content-Type: application/json
Access-Control-Allow-Origin: *
D/OkHttp: {"message":"Unauthenticated."}
<-- END HTTP (30-byte body)
D/AndroidRuntime: Shutting down VM
E/AndroidRuntime: FATAL EXCEPTION: main
Process: ir.i9i.splendor, PID: 5740
java.lang.NullPointerException
    at ir.i9i.splendor.Profile$getUserDetails.onResponse(Profile.kt:39)
    at   retrofit2.ExecutorCallAdapterFactory$ExecutorCallbackCall.run(ExecutorCallAdapterFactory.java:70)
    at android.os.Handler.handleCallback(Handler.java:739)
    at android.os.Handler.dispatchMessage(Handler.java:95)
    at android.os.Looper.loop(Looper.java:135)
    at android.app.ActivityThread.main(ActivityThread.java:5254)
    at java.lang.reflect.Method.invoke(Native Method)
    at java.lang.reflect.Method.invoke(Method.java:372)
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)

Answer 1

您可以在 Retrofit 的 onResponse() 方法中使用 errorBody() 处理它：

if (response.code() == 200 && response.isSuccessful) {

                       // do whatever you want when the response is 200 and isSuccessful

                    } else {

                        if (response.errorBody() != null) {

                            val jsonObj =
                                JSONObject(response.errorBody()!!.charStream().readText())
                            val getMessage = jsonObj.getString("message")
                                    
                             // Here get the message and print it out
                            showSnackBar(yourActivity, getMessage)

                        }
                    }

因为您检索了 401 错误响应，您将能够在 onResponse() 方法中处理此类错误。

如何通过 kotlin 中的 retrofit2 获取 json

how get json by retrofit2 in kotlin

android

kotlin

retrofit

retrofit2

retrofit2.6